If you ever get your hands on Fire Extinguishers they are amazing for project you just need to keep them and all their parts.
When I was starting this project was looking for a Whistle valve of which costs total of 70 euro. Fire extinguisers have these built in and are free from local scrap yard.
Fire extinguisher (free)
Some gas hose (5€)
Some gas connectors and pipe (5-10€)
Welder or tap and die (free)
Door actuators (for last part, not needed yet) (free)
Gas bottle tank with regulator
Fire Extinguishers making fire (priceless)
you will need to read on to see the videos.
Step 1: Dismantel fire extinguishers
To dismantel the fire extinguishers you will need a table bench clam and large monkey wrench.
Make sure to remove all pressure from fire extinguishers, you can do this by drilling small hole in lower end of extinguisher (we will make this bigger later on) BE CAREFULL
We removed the top of fire extinguishers but did not have to in end. To do this if your interested clamp the main body of fire extinguishers in vice and then grab the top of the fire extinguishers with wrench.